Cell Value Vanishes on Dropdown (colour selector)

When I set the cell editor to colour, I can edit the value - and it works fine.


However as soon as I edit the cell again, the old value vanishes and I'm left with a starting value of clWebWhite (or #FFFFFF etc).

This seems to happen for all colour drop down types, and for all colour display types.

I want to use Spectrum and Webname or HEX - but in all cases the value returns to white when I try and edit again.

Is this a setting I've missed ?